ISPConfig User & EMail Question

I have installed ISPConfig 2.3.2 onto a server running UBUNTU 6.06
and have found that when in 'User & Email' 'Add User' form that the domain after the 'mailbox-name' & '@' is not just 'giganetwireless.com' as it should be.

Rather I am offered three options two being identical to one-another:
1) @www.giganetwireless.com
2) @www.gowireless.giganetwireless.com
3) @www.giganetwireless.com

How would I make the proper domain option show up rather than what I have?

No I did not add it as a co-domain.
I just assumed that only pertained to subdomains at this point...

Once I am allowed to re-add my domain to ISPConfig I will add giganetwireless.com as a co-domain definately.

Could you share any incite as to why when a domain is deleted from ISPConfig, the client, all Trash emptied, ALL DNS records deleted, Trash emtptied, validated that there was no existance of giganetwireless.com anywhere in '/etc/bind' contents.
However after adding myself as a client once again and then trying to re-add my domain ISPConfig tells me that domain is in use by another account??

Could you share any incite as to why when a domain is deleted from ISPConfig, the client, all Trash emptied, ALL DNS records deleted, Trash emtptied, validated that there was no existance of giganetwireless.com anywhere in '/etc/bind' contents.
However after adding myself as a client once again and then trying to re-add my domain ISPConfig tells me that domain is in use by another account??

I found out where my error was!
ISPConfig after setting up new accounts enters these values into NS1 & NS2 in the Options tab of DNS Management for each client, just changed those and all was good for being able to ping 'mail.giganetwireless.com'

I will look through SF forums to see if an article is posted with a solution to my present problem of the server not allowing me to send email out- it won't authenticate my president <at> giganetwireless <dot> com address password with resepct to outgoing email???